The Complete Solidity Course - Zero to Advanced for Blockchain and Smart Contracts - The Fallback Function in Solidity I

The video tutorial explains the concept of fallback functions in Solidity, highlighting their characteristics and limitations, such as being anonymous and having a gas limit of 2300. It demonstrates the deployment of two contracts and compares the transfer and call methods, showing their impact on gas usage. The tutorial emphasizes the importance of understanding these concepts when writing Solidity code.

What is a key characteristic of a fallback function in Solidity?

• It must be declared as internal.

• It has a name and takes inputs.

• It does not have a name and does not take inputs.

• It returns outputs.

Why is it not recommended to write too much code in a fallback function?

• It will increase the gas limit.

• It will cause the function to fail.

• It will make the function slower.

• It will reduce security.

What is the main difference between the send and call methods in terms of gas?

• Send method provides more gas than call.

• Neither method uses gas.

• Both provide the same amount of gas.

• Call method provides more gas than send.

What is the first step in deploying the contracts as demonstrated in the video?

• Deploy the second contract first.

• Write the contracts.

• Check the gas limit.

• Compile the contracts.

How is the balance checked after transferring ether using the transfer method?

• By using a third-party tool.

• By opening the fallback contract and checking the balance.

• By estimating the gas used.

• By checking the transaction logs.

What is a potential risk when using the call method with extra gas?

• The function will return incorrect outputs.

• The function will not execute.

• The function may fail if too much gas is used.

• The function will always succeed.

What must a fallback function be declared as in Solidity?

• Internal

• Public

• Private

• External